Inspired by recent experimental sub-atomic measurements using analytical aberration-corrected scanning transmission electron microscopes (STEMs), we studied electron probe propagation in crystalline SrTiO3 at the sub-atomic length scale. Here, we report the existence of sub-atomic channeling and the formation of a vortex beam at this scale. The results of beam propagation simulations, which are performed at various crystal temperatures and STEM probe convergence angles (10 to 50 mrad) and beam energies (80 to 300 keV), showed that reducing the ambient temperature can enhance the sub-atomic channeling and that STEM probe parameters can be used to control the vortex beams and adjust their intensity, speed, and area.
@article{arxiv.1808.03348,
title = {Sub-Atomic Channeling and Vortex Beams in SrTiO$_3$},
author = {Jong Seok Jeong and Hosup Song and Jacob T. Held and K. Andre Mkhoyan},
journal= {arXiv preprint arXiv:1808.03348},
year = {2019}
}